speed density cam question

[jaackal]

Which cam should I use with a speed density 88 LX 5 speed? I understand they reccomend converting over to mass air, however, I dont want to convert now. Is there any type cam or brand you recomend? Thanks

 

[Mike86Stang]

There are plenty of cams you can use with speed density. The main thing you need to look for is a good vacumme signal for idle characteristics otherwise the computer will assume it's under a load & run too rich.

Look for cams with a wide LSA (114ish + but maybe a 112 if the vac is high enough).

Lift isn't a consideration beside piston to valve clearence & valve spring bind.

Duration really shouldn't be too much over 220* @ .050 lift.

You may want to check out www.50tech.com (alot of SD folks running cams/ intakes / heads on there)

 

[TheBocSez]

One of the more popular cams used in SD cars in the Crower 15511 cam. Think the specs are 218/224 @ .050 and 469/496 lift on a 114 LS. Comp cams also has several cams with similar specs on a 114 LS.

 

[CRASH7772]

Can someone explain what in a cam alters the vacuum? I have stage 2 ported Windsor Jr heads with 600 lift springs. I plan on running 7/16th stud mount 1.7 roller rockers to add lift which I know this does nothing but add lift meaning it doesn't alter the vacuum at all. I want to clear .500 lift with these heads but I noticed that the Crower cam mentioned above has alot higher exhaust than intake. Would I have any valve/piston issues with that much lift on exhaust? Basically .499 intake and .526 according to the specs above and figuring on .30 extra lift for the roller rockers.

 

[Mike86Stang]

DUration & lobe seperation are the primary contributing factors to vaccum. lift has less to do with it.

 

[Gearbanger 101]

Stock with 1.7:1 RR. No fuss, no muss! Besides, unless you've got heads/intake, exhaust, etc to go with it. It's not worth the trouble to swap out your cam anyway.